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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39247bd1b17c1acf7f70a2a97e1d11b4c1be57e8ed436b1e54377a5d0fc8de9f' 
  AND token = 'Sdg1U9HexX+e9dtqhR+KrvEpDwwfptaQKliuujJ4Z7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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