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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b97f4c5cafa4ca05c93b1860819812181ff657fa74c4f4e8e33ecc0ad8baa7a' 
  AND token = 'c7iQOS2wpKzreqflLcGP8Y0LU/otSUjlbPxDoXb8Y48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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