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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff6b9f7e962ad67108a55c06295dd19bd68bfd9bff60b91140789db5456007bd' 
  AND token = '384ahze96UGYywxbY7hywutyhO4L5BiYQDmUrlwPGeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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