SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '506c64b2fd6879912706f3fc75639b478474c2c80c0982f575b02b62fa516009' 
  AND token = 'CXjh5qBmG8SodtAQREUMTojySfvEVh4NUk3h8ZGH1Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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