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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b7dc2ce8fa619a5a27a14c1cf222da7636297f1851ef3a1f2078add159c73c5' 
  AND token = 'w0vviAJ0wpukTme+bRWIx7yGl60qze237/q5uyhTeNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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