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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fcb866e4729e6ed25e2fa32fc90e930d3ff287a1394e33cbe837dbab2f45ba0' 
  AND token = 'NtX9vyKvgaN8VExzMvZH5lTTXlle/96JYRvJGioNcbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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