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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '700a0ab24aee69263ddba1c9c9f355acb58d97d157f27b2fc642ee2762ffbdbc' 
  AND token = 's9tOsAzWDqs8mgMbPuQDslkMDisgxGf+jm0INtxCi3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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