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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '150e1fa762df5aaf92a36a2a4a674f24916144bbcb9d3ec0b8bcee1a6c574044' 
  AND token = 'ctY3TW3shayJkLP+ttRB7u9/YSNZDdBGdERT9tUsAS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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