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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48cd6c8ec6336c6b253d5b60c75bf843c3872fdea4d01c2399f6c044e0dd85e1' 
  AND token = 'DF/MbIwswiulORKY3aoB252eXeuvkz067xc4AQKN2k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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