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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b92cd65cac9003c97fa8892c8f787c52a760ffcecbbacd11900de03a6e77cb0' 
  AND token = 'lz86KBnnCR6d0V7C0aE7N647z1IWv5XrH4Hd3qHEN80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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