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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b36ceb753b3ed86c13fefe53e1649e37a67e1dfcc01e47ad35983da60f7050d0' 
  AND token = 'SJWIioI9ejI+MACQ2SgHURVPSdzz1hsLvk94mwy6/3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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