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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2f692b4d1c6e7a92e999d066528192f884971a72f506ef5ed2904a94d30c22c' 
  AND token = 'rKpeuGp6B/d09G9hvy9cG88XCRmuyE6NVTuhsZ1B4z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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