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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '057ca98dd589808d846f1d3d2894ccf7c646f0e218c28ed9f8cce8ad2646d4ac' 
  AND token = 'VLmbF0WulrtsVwc3pfI0sQXitQuRdhP2U4ryNfnzbyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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