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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2964d94f3117214fe9ef6e0b658dc9191fe88db0e3fbceb525cce61f8188a740' 
  AND token = '6PNuY8Tanu5wWlEEsLnY4dBmXoLclJFTiTaC7yngmy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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