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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '889340d9c7b604c7e867056090ec64683446ae2d4ff90adf8a255cbc9e2af089' 
  AND token = '5FiGcfhESTMSYrqohhfFCfi2oeR8epPPKC5F89JmfMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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