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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0036a783ce8d514a482268ce1ac493f378803502f9f1c4fd3cd836e6cc1d3348' 
  AND token = 'o0LGrRI7pGlGBEbuNJiMV2jgP2T5Bk24MOfKvoAiyi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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