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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18d125b43c8d3bc2e1fcdecac72f8c4b5115de5817b63f49071e14ff14730dc5' 
  AND token = 'LccLm7+pG1T1eRqisd1vMRMYnCOpI3bRNHlR8aJg1E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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