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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebb88c293f2510014330e3b992ecb4e045cd218ec95f2348f53385628f26c665' 
  AND token = 'QPy8Jk6lbsFqk3Uch61zfZcsRATgsZKH8NgvSp9H2w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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