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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c83071ebce7f798300eb8729e468ef6bbbd4a3b2b9cdd41e700f54f9474102a6' 
  AND token = 'TnVzahL8Hm/dVVFmnDX2ph/XJYN2UiVOSmo2KclzEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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