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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c69d2e56abf3f40601a417e4d77ffd8ab7ff92cfc4d75d55f82f54be3c34e2b' 
  AND token = 'ASbaHg6Xo1XpwGI59uf0IvB6UALlMprNbHaVdY1XTdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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