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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6262639b258281cffc8aabbcb3ae23d5fee8e736dab7e539a6fdcebd2c63f7a6' 
  AND token = 'bxanNrpBaPEiBNbgVQ60YeET5QsFfF4cQk2d5kJ62yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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