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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c44cf17368c7df6154bb00928e6728fa05903a8c27bd490ea4f6c5fdc4965e28' 
  AND token = '+0Ni2h8DUPcO6/jU/mMvx/gdf/xsEi/lTRECesxWluc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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