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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9a3b2ede477e494697ed2dbb570d4d08fd42ab9ac757eedd4afe685594f414a' 
  AND token = 'UEHb+w85NLUXxWNu5UgL0rmmEy01fuqurIfkG761gU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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