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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f4540ca911e45c2b8919d1521b2aa72a63ea421882dd1e2feceed661a49fa49' 
  AND token = '8EP7lS2f24OunYdM4W/J7wG3076y4jQDUpXJfpi+e7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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