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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a73eb3a98000b9a8d67f74270e23a441decf4a705f59e7eab529098d8cb8fef' 
  AND token = 'MXCRT4LiOVmePOe86Os5lfS2u7nOfAkNaqQ7hOg+TRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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