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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09cdb19bc0716fd11706586a9da22f6153c56fe677b0956989accdc726be319c' 
  AND token = '8XTxgtN/B2FJ14coa9F7xJ5HPh9+qMIDNHnk0kOQtAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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