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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71ead00fa922c36f9e571db305b2d306f9e81ca469c21f120817759634376ea6' 
  AND token = 'GC0yofMVZnrDodAVjTKku1/aaJasIAc/EwbU9h8Cy0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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