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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f807ec910c231ef2129248ce579a228599377c9ebb7e0c33265fad6ac151c50' 
  AND token = 'dcHTdMh/Bv210LBrwUzNSXy7DSAk3ZLcb/SUegAY5l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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