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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c6c241f83bc15ee165bcc07e026374eec213c3ccba328b4cb3a4398db9bc030' 
  AND token = 'spFRQZ5Vz7b2FX3d5JIYUgmoDypnY1UzeYvQV3Ccvnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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