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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b1ca64a7c11da5d52a0d267d538b5a5397869c4f620a83c936e0e3b3a80e523' 
  AND token = 'GLjSWa5Dh3PIrdYBQGScuMYxO4KZCmEnKU3NK0Zt6z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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