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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcfaa54222c8e3819d825b12e7e5a9a6a9b97495305fcc6783bbce16af9bd2e4' 
  AND token = 'Eq6btrgDRiinCiUs+En9QxypJyYgHBAwF0zsfELO2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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