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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e60b2c42bdfdf2842cbf3926550ef64c599a430743be55f37ea9e71eff917c6e' 
  AND token = 'Edff8AiCwVIAMwcbjbE4qdcNbqDVLxRg1+k6xMLGhHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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