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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b831de00b9dab5c44ec2c22761774b16fc94c91f0d5e04d410bb55caf1eff1a' 
  AND token = '0/EcgOr8whigkpda3LrXfV+OCZ3ouR+sFM2O6NLMZzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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