SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a702b4c46c2001f18ed3e91a06f2c6134f0043ef20265da89d8c240ff5beeb2' 
  AND token = 'I+zbcGlv6B66Cgm/UcuVXsy7XjKfdptHcDPzHwf+0II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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