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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0c33caa369275dc1ca398d6bf6c587f9f6a48808dc6081212fbbf7696c8c0fc' 
  AND token = 'XgrLk4XrxxaioBW5mFORzQ2debLdtbLDuN37spnD4PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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