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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96f9194f7c8a32251876a848f9e48fcf55798bb8e022b6743b42a5e77086aed5' 
  AND token = 'NozLNDj6TilWBCa57tbXN+kw2o+8gWsKaKRVDIp0IOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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