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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd677839190e29e4f9a8c32e31e728c6e4cb6271f02da78c4c92107e7d3808afb' 
  AND token = 'RoeRKb9qTSQaoX+V6bYU2a5Wb57LUv3CnKdE0VlUV7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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