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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '637151f0e28f1afeda857902cab17b71111e928d2da45f78a587358f1bdb2686' 
  AND token = 'VwIf7rfx5C+8ky/YMDPaIUCbzI/BIMlUSxUvqxHqtFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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