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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9ab7e558944645451dc6ac2e9a1dc0a210ac98b83e3fe6166b253e8ec507ba' 
  AND token = 'ZiETA4fXzDioN3NOI2V/2Z5SsXY2a6MRFhOcdSr1XOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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