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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d0de34cea0aab8a868e7d4eaceb8dff5175a168ad808484b4257e7a4afd355c' 
  AND token = 'ZZVElKi4vuGKu4t/5cf8G/an3q99AKZATYxyhGErFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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