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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '204a39a49102420fa860b09428eb6e3334cb19aeb6e227d77c094961303a46ce' 
  AND token = 'vWCz9h8MJ/Ue/aSrpG1P8In1TyKKuQ/H7Lx/QJuAlSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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