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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b315d1bca1e54b4fd38c3ac5ce4a5faa20ae3428665c1d65513118ecfc9cc186' 
  AND token = 'ux9UMdU1n55v5Ti9ccYZ65AW5ocF5HvzjaBRivgq88s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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