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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '859ffa687a5c68cdf0c589a39f8f712ce96f92449692b284344da1a10cd63898' 
  AND token = 'xQq9dWfFtyKk7hmHs6n6RtlZ3KYgE8pRsa3oKX+vXEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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