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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feda7d22900fb48da0a4774439a753cc3d89ffdacae7cc6964c0a52361d8a551' 
  AND token = 'ijoTuq27HLTO/8gmeM/XBSYYmjXdUkCh8d99IHEN7EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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