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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd149254aa6e12ef3c3224b3c961684de049f41e7812fcda7ed0de9c8298d8fcf' 
  AND token = 'h78tWn73bIqWIoFX8WWlEIMQwEpGRaEFuEBLAus3WmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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