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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a255e128418cab45ba619fbca11e8598c18a3d67f4dd503ee350164e3212c46' 
  AND token = 'Ik+S6/NZUFBHiTzgHOGYzuToK5p2wA5X6BN3116chsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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