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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7dab2a325dbfd98ddc6c7c1e43360a6fad8ee53fdfa7ce2a44e6731e132e3b2' 
  AND token = 'a4/wghZgBOicQM3FdVreaCcl1ZMcx7vRKI7dRVi4z6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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