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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9810b0c78bdf865ca4d0aac8070069b9fa309ba1ee9290a49bc48c24f9905f6' 
  AND token = 'Kq2cvGZOpCmHdZ/OCFvzCC9TOTW/OdLJqeMP/MxPYvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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