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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2885b5bf7a7e8683cb6144932d2950290189862f6677148a36608a8fdc5a6307' 
  AND token = 'J1NuSd0uOUoOIKdkmdgfTmA33tupuNWFA9Btin5gOU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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