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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7bcaeb61a591b7aae2d942c7c4de3b0ad9a46c169ac0481333a37c8bfe300d' 
  AND token = 'mn4wGfJqRmuhvvSPRFsk6i4eVdSsHErdq1O2GI8P8fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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