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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0031755e7ad82b1f976658bf76c87c8648ddf53453b1f2f311d47f1ff230fd67' 
  AND token = 'iQS1+ClCRmmfNY1TkxNffAsN3Ef+pRUXS03fBuGvBZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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