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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '444024accc600ab5cce49031ae6f5e2c2c888f06121afa56e73a3b56ad86b37c' 
  AND token = 'CCo2tIFKR8DeF3Db7NRDV0qtL4v3rphIKM03kJ2SOmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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