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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeaa930157cf8a5cd06cab8a9203548fc7db8792acdb41cef8cd4ccb6de0a621' 
  AND token = 'FsfCCpTGC/MFmTIjRvQ278LzC4YRtZk1FNvX/WOyQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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