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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c695723169d578ffc723e4ef55b6b8230df03e123648ede8442e5ede995341aa' 
  AND token = 'aEYYhPqqQ4TSR9PimSN9OxV7jh2tm18Vl4c428ks8kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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