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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '289b7309133bc9ab22280793309a7abbe99199c9503f0918f7ca3ac3d7e9d0eb' 
  AND token = 'EZf7NmQkV7g0f6yqBhRL4C1K1kdcCocQG64mLgAFw7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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