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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f48771bfa7a0bde4713ba442b1b908e579c1656a33327641723accb0146212e' 
  AND token = 'oSBtvECF5zMfDyW1Uo10RcxsR1P4/zlpo3PeqkoGJDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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