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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7838c9c31a560d0747f0205852e906932249e4acb0ddd2011f3e52377747db4f' 
  AND token = 'voK7X8LkxOi5ue0Z76Zv74Otu40XoG7ixha0gDer7fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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