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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed890df17eeccadc40af1ba7944a082c7b27972cf0be1ae3dfcd0be471ac295' 
  AND token = 'gYJzC9dbqcHzRCw9Kqcn9LW+d+zBKrUA/H3EiX6C11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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