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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f0d3118823f29a17d42a362873c36fb1e5f63557cdc803637ad3c32ee8f97f0' 
  AND token = 'cxOdk1Rvn8Y7+y4VDFK4d338l7761lbM/zEdPMcM7uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}